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J-KU vs Relief Sciences: heat pump ratings compared

Against heat pumps of the same size and type, a typical J-KU model beats 62% and a typical Relief Sciences model 66%. Relief Sciences rates slightly higher overall.

Covers older R-410A heat pumps, no longer installed new. See models sold today · Updated

J-KU

62%

of similar heat pumps beaten by its typical model

Well above average

10 models listed

Relief Sciences

66%

of similar heat pumps beaten by its typical model

Well above average

10 models listed

Rating by ratingEach bar is the share of same-size, same-type heat pumps that a typical model beats, so the two brands compare fairly even if they make different sizes.
  • Efficiency on a 5°F dayCOP at 5°FJ-KU: Beats 49%Relief Sciences: Beats 38%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FJ-KU: Beats 66%Relief Sciences: Beats 72%
  • Winter-long heating efficiencyHSPF2J-KU: Beats 48%Relief Sciences: Beats 73%
  • Summer-long cooling efficiencySEER2J-KU: Beats 67%Relief Sciences: Beats 76%
  • Hot-day cooling efficiencyEER2J-KU: Beats 71%Relief Sciences: Beats 67%

Average (50%)Dashed outline: the other brand, for comparison

Want ranks, distributions per size class and cold-weather curves? Switch to Advanced

Rebate standards

Share of each brand’s models that meet the level. Programs can have other rules too.

  • CEE 2025

    J-KU
    100%
    Relief Sciences
    100%

  • Xcel CC

    J-KU
    90%
    Relief Sciences
    90%

  • CEE Advanced

    J-KU
    0%
    Relief Sciences
    0%

  • ENERGY STAR CC

    J-KU
    80%
    Relief Sciences
    0%

Top cold-climate picks, ductless 5 tons and up

Only units that keep at least 70% of their heat at 5°F, ranked on heat kept, efficiency at 5°F and seasonal efficiency (HSPF2), against units their size.

Showing Ductless, 5 tons and up (57,000 Btu/h and up cooling). What size is my system?

J-KU

No ductless, 5 tons and up model from J-KU.

Relief Sciences

No ductless, 5 tons and up model from Relief Sciences.

These are certified test ratings, not a recommendation for your home. The right size comes from a load calculation by a contractor.

Next steps

The advanced view adds ranks, both brands’ models inside every size class, standout models per rating and cold-weather curves.

Open the advanced view